Hi, I'm a PhD student from Chicago. I'm currently working on a project where I would be adding some monitoring and control systems to existing old radiators that are controlled manually by valves. I stumbled upon this project and it sounds very interesting. I have designed and assembled several Arduino boards (off the shelf and custom PCB design), so I'm aware of the space.

I was wondering if I can get my hands on a device to test. I am unable to buy from the store as they appear to either be out of stock or not currently sold to people who aren't developers.

I measured the inner diameter to be around 1 1/4" in diameter. Probably closer to M30 in reality though. I may be able to tweak the design to work with 915MHz, my main requirement is the actual hardware that can replace this manual valve.

What do you mean it works with a 3rd party radio controlled head? How does it communicate with 3rd party ones?

Thanks for the response. I assume this product is probably updated and thatpart number is no longer sold. Either that, or the maintenance departmentjust has really old datasheets! I've ordered a few known M30s and willupdate when they arrive.

The goal is actually fairly simple in theory: I'm trying to achieve controlover the valves remotely, but without using proprietary off-the-shelftechnology.

The ideal scenario would be to replace the valve with a device that fitsthe exact thread and that is controlled by perhaps an Arduino or aRaspberry Pi which can adjust the flow and consequently, the roomtemperature.

I have some experience in programming microcontrollers and messing withelectronics, so that part isn't a problem. The problem is finding the righthardware that can replace an ordinary TRV with something that's hackable toallow an Arduino to communicate, or even Bluetooth/radio valves that havesome way of communicating without interacting with a cloud backend.

I was hoping an openTRV is the solution to this, unless there are differentways to achieve the same?